I use Jarrow EPS, Jarrow IBS, and Jarrow S. Boulardii + MOS. I take one each of the first two per day. These are Institut Rosell strains at a good price. The S. Boulardii + MOS is, I find, too effective in that it makes my stools harder slightly. I take this one only once a week, though I will likely seek out another S. Boulardii supplement. Right now, these are 30% off at iherbDOTcom (as a PSA, Support Local Foodstores when possible!)--get the big box of EPS, for sure.
I reccomend Sugars That Heal by Mondoa to introduce you to MannanOligoSaccharides, whole aloe supps, and glucopolysaccharides.